I just found one of the more clever usages I've seen of a tag cloud. A tag cloud is a new form of histogram chart where words or "tags" that appear more often are shown in a larger font. The first one I ever saw was on Flickr a year or two ago, but they've since become quite popular. I even have one right here on my blog for my post topics (see "Topic Cloud" left sidebar). Check out the following article:
Here are two quick examples to pique your interest:
Again, you can see them for all the candidates on pollster.com.
I found the site via this interesting blog about charts that I might subscribe to.